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Four upstate residents were arrested on prostitution charges Monday, accused of setting up shop at La Quinta hotel, the same place a serial-rape suspect was accused of attacking a prostitute in March.

Monday's arrests resulted from a police sting. An undercover officer arranged to meet a prostitute at the hotel on 540 Saw Mill River Road through backpage.com, a classified ads website, police said. When the officer showed up about 7 p.m., police said, he encountered and arrested two prostitutes, along with a "lookout" and driver who were working with them, police said.